Anti-cross threading screw

Abstract

An anti-cross threading screw ( 1 ) includes a first threaded portion ( 4 ) including a first thread ( 5 ) having a first outer diameter ( 6 ) and a first pitch ( 9 ) and a second threaded portion ( 12 ) having a second thread ( 13 ) having second outer diameter ( 18 ) and a second pitch ( 21 ). The second threaded portion ( 12 ) is designed as an anti-cross threading portion. The second thread ( 13 ) has enlarged an thread crest ( 15 ). The second outer diameter ( 18 ) of the second thread ( 13 ) is smaller than the first diameter ( 6 ) of the first thread ( 5 ). The first pitch ( 9 ) of the first thread ( 5 ) is different than the second pitch ( 21 ) of the second thread ( 13 ).

1. A screw, comprising:
 a first threaded portion including a first thread having a first outer diameter, a first thread crest, and a first pitch; 
 a second threaded portion having a second thread having a second outer diameter, a second thread crest, and a second pitch,
 said second threaded portion being designed as an anti-cross threading portion, 
 said second thread crest of said second thread being enlarged compared to said first thread crest of said first thread, 
 said second thread crest of said second thread being designed to have a round shape, 
 said second outer diameter of said second thread being smaller than said first diameter of said first thread, and 
 said first pitch of said first thread being different than said second pitch of said second thread. 
 
 
     
     
       2. The screw of  claim 1 , wherein said first threaded portion and said second threaded portion are arranged in an axially spaced apart manner such that there is an axial distance between said first threaded portion and said second threaded portion. 
     
     
       3. The screw of  claim 2 , wherein the axial distance between said first threaded portion and said second threaded portion corresponds to at least half the pitch of said first thread of said first threaded portion. 
     
     
       4. The screw of  claim 3 , wherein the second pitch of said second thread is greater than the first pitch of said first thread. 
     
     
       5. The screw of  claim 2 , wherein the second pitch of said second thread is greater than the first pitch of said first thread. 
     
     
       6. The screw of  claim 1 , wherein the second pitch of said second thread is greater than the first pitch of said first thread. 
     
     
       7. The screw of  claim 6 , wherein a ratio between the second pitch and the first pitch is approximately between 1.02 to 1.5. 
     
     
       8. The screw of  claim 1 , wherein a ratio between the second pitch and the first pitch is approximately between 1.02 to 1.5. 
     
     
       9. The screw of  claim 1 , wherein said first thread has a first core diameter and said second thread has a second core diameter, said first core diameter being greater than said second core diameter. 
     
     
       10. The screw of  claim 1 , wherein said first thread has a first pitch diameter being approximately identical to said second outer diameter of said second thread. 
     
     
       11. The screw of  claim 1 , wherein said second thread includes flanks having a round shape. 
     
     
       12. The screw of  claim 1 , further comprising a head and a free end facing away from said head, said second threaded portion being arranged to face said free end and said first threaded portion being arranged between said second threaded portion and said head. 
     
     
       13. An anti-cross threading screw, comprising:
 a head; 
 a shank being connected to said head and having a free end facing away from said head, 
 a first threaded portion including a first thread having a first outer diameter, a first thread crest, and a first pitch; 
 a second threaded portion having a second thread having a second outer diameter, a second thread crest, and a second pitch,
 said second threaded portion being arranged to face said free end, 
 said first threaded portion being arranged between said second threaded portion and said head, 
 said second threaded portion being designed as an anti-cross threading portion, 
 said second thread crest of said second thread being enlarged compared to said first thread crest of said first thread, 
 said thread crest of said second thread being designed to have a round shape, 
 said second outer diameter of said second thread being smaller than said first diameter of said first thread, and 
 said first pitch of said first thread being different than said second pitch of said second thread. 
 
 
     
     
       14. The screw of  claim 13 , wherein said first threaded portion and said second threaded portion are arranged in an axially spaced apart manner such that there is an axial distance between said first threaded portion and said second threaded portion. 
     
     
       15. The screw of  claim 13 , wherein a ratio between the second pitch and the first pitch is approximately between 1.02 to 1.5. 
     
     
       16. A screw, comprising:
 a first threaded portion including a first thread having a first outer diameter, a first thread crest and a first pitch; 
 a second threaded portion having a second thread having a second outer diameter, a second thread crest and a second pitch,
 said second threaded portion being designed as an anti-cross threading portion, 
 said second thread crest of said second thread being enlarged compared to said first thread crest of said first thread, 
 said thread crest of said second thread being designed to have a flat shape, 
 said second outer diameter of said second thread being smaller than said first diameter of said first thread, and 
 said first pitch of said first thread being different than said second pitch of said second thread. 
 
 
     
     
       17. The screw of  claim 16 , wherein a ratio between the second pitch and the first pitch is approximately between 1.02 to 1.5. 
     
     
       18. The screw of  claim 16 , wherein said first thread has a first core diameter and said second thread has a second core diameter, said first core diameter being greater than said second core diameter. 
     
     
       19. The screw of  claim 16 , wherein said first thread has a first pitch diameter being approximately identical to said second outer diameter of said second thread.